class Solution {
public:
    int wiggleMaxLength(vector<int>& nums) {
        int n=nums.size();
        vector<int> f(n,1),g(n,1);
        int ret=1;
        for(int i=1;i<n;i++)
        {
            for(int j=0;j<i;j++)
            {
                if(nums[j]<nums[i])
                    f[i]=max(g[j]+1,f[i]);
                else if(nums[j]>nums[i])
                    g[i]=max(f[j]+1,g[i]);
            }
            ret=max(ret,max(f[i],g[i]));
        }
        return ret;
    }
};
